/**
 * 点击波纹效果
 *
 * @param  {[event]} e        [description]
 * @param  {[Object]} arg_opts [description]
 * @return {[bollean]}          [description]
 */
export default function( e, arg_opts ) {
  var opts = Object.assign( {
    ele : e.target, // 波纹作用元素
    type : 'hit', // hit点击位置扩散center中心点扩展
    bgc : 'rgba(0, 0, 0, 0.15)' // 波纹颜色
  }, arg_opts )
  var target = opts.ele
  if ( target ) {
    var rect = target.getBoundingClientRect()
    var ripple = target.querySelector( '.e-ripple' )
    if ( !ripple ) {
      ripple = document.createElement( 'span' )
      ripple.className = 'e-ripple'
      ripple.style.height = ripple.style.width = Math.max( rect.width, rect.height ) + 'px'
      target.appendChild( ripple )
    } else {
      ripple.className = 'e-ripple'
    }
    switch ( opts.type ) {
      case 'center':
        ripple.style.top = ( rect.height / 2 - ripple.offsetHeight / 2 ) + 'px'
        ripple.style.left = ( rect.width / 2 - ripple.offsetWidth / 2 ) + 'px'
        break
      default:
        ripple.style.top = ( e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop ) + 'px'
        ripple.style.left = ( e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft ) + 'px'
    }
    ripple.style.backgroundColor = opts.bgc
    ripple.className = 'e-ripple z-active'
    return false
  }
}
